The Crimson Consuls was a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding which was a Successor Chapter of the Ultramarines. The Crimson Consuls were destroyed entirely by the machinations of the Alpha Legion Chaos Space Marines, possibly on the orders of Alpharius (or Omegon masquerading as Alpharius) himself, who had targeted the Crimson Consuls for destruction so that their gene-seed stocks could be delivered to Abaddon the Despoiler and the Black Legion to help that Traitor Legion replenish its ranks before the unleashing of the 13th Black Crusade. The Crimson Consuls were based on the ice-covered Hive World of Carcharias in the fortress-monastery known as the Slaughterhorn, which lay at the peak of the world's capital hive city of Niveous.